#2 Windows Phone:

The key beneficiary here is last century’s leader in the mobile manufacturing – Nokia. The Finnish manufacturers had announced a partnership with Microsoft on February 11, 2011 making Windows Phone the primary operating system for Nokia, a partnership that they will cherish as 53 percent of the Windows Phone users have stated that they are very satisfied with their phone.

Now it seems clear why the new Nokia Lumia launched with the Windows Phone 8 has sold out. Microsoft will be very satisfied with their effort only behind another giant in this category which has been leading the domain for a long time, Apple.

#1 iOS Apple:

Apple is the clear leader here (no surprise), with 71 percent of the users saying that they are Very satisfied with their phone. As of September 12, 2012, Apple's App Store contained more than 700,000 iOS applications, which have collectively been downloaded more than 30 billion times and as of June 2012 more than 400 million devices had been sold worldwide. That accounts for a lot of happy users but the surprise package of windows phone raises eyebrows as to how it will grasp the market in the next quarter.